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Separating a Real-Life Nonlinear Image Mixture

Almeida, Luis B. (2005) Separating a Real-Life Nonlinear Image Mixture. [Preprint]

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Abstract

When acquiring an image of a paper document, the image printed on the back page sometimes shows through. The mixture of the front- and back-page images thus obtained is markedly nonlinear, and thus constitutes a good real-life test case for nonlinear blind source separation. This paper addresses a difficult version of this problem, corresponding to the use of "onion skin" paper, which results in a relatively strong nonlinearity of the mixture, which becomes close to singular in the lighter regions of the images. The separation is achieved through the MISEP technique, which is an extension of the well known INFOMAX method. The separation results are assessed with objective quality measures. They show an improvement over the results obtained with linear separation, but have room for further improvement.

Item Type:Preprint
Keywords:independent component analysis, source separation, nonlinear, image separation, document processing
Subjects:Computer Science > Statistical Models
Computer Science > Machine Learning
Computer Science > Neural Nets
Computer Science > Artificial Intelligence
ID Code:4360
Deposited By:Almeida, Prof. Luis B.
Deposited On:20 May 2005
Last Modified:19 Dec 2009 19:21

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